This is a story of a rape accusation that would not die and a misshapen version of college justice meted out in three chapters. Let’s begin with two Michigan State students looking to hook up in March 2015, mess around and perhaps have sex. Soon after, the woman accuses the man, Keith Mumphery, who would become a pro football receiver, of sexual assault in her dorm room. The police investigate. Mumphery turns over the text messages from his phone and provides a DNA swab. Prosecutors conduct interviews. The accuser does not return calls. They decline to prosecute.